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We present the physical properties of AKARI sources without opticalcounterparts in optical images from the Hyper Suprime-Cam (HSC) on the Subarutelescope. Using the AKARI infrared (IR) source catalog and HSC opticalcatalog, we select 583 objects that do not have HSC counterparts in the AKARINorth Ecliptic Pole (NEP) wide survey field ($\sim 5$ deg$^{2}$). Because theHSC limiting magnitude is deep ($g_{\rm AB}$ $\sim 28.6$), these are goodcandidates for extremely red star-forming galaxies (SFGs) and/or activegalactic nuclei (AGNs), possibly at high redshifts. We compile multi-wavelengthdata out to 500 $\mu$m and use it for Spectral Energy Distribution (SED)fitting with CIGALE to investigate the physical properties of AKARI galaxieswithout optical counterparts. We also compare their physical quantities withAKARI mid-IR selected galaxies with HSC counterparts. The estimated redshiftsof AKARI objects without HSC counterparts range up to $z\sim 4$, significantlyhigher than that of AKARI objects with HSC counterparts. We find that: (i) 3.6$-$ 4.5 $\mu$m color, (ii) AGN luminosity, (iii) stellar mass, (iv) starformation rate, and (v) $V$-band dust attenuation in the interstellar medium ofAKARI objects without HSC counterparts are systematically larger than those ofAKARI objects with counterparts. These results suggest that our sample includesluminous, heavily dust-obscured SFGs/AGNs at $z\sim 1-4$ that are missed byprevious optical surveys, providing very interesting targets for the comingJames Webb Space Telescope era.

Search for Optically Dark Infrared Galaxies without Counterparts of Subaru Hyper Suprime-Cam in the AKARI North Ecliptic Pole Wide Survey Field